Scraper



March 11, 1930. B. E. ROSE 1,750,132

SCRAPER Filed Feb. 9, 1929 INVENTQR B. ERoSe BY Q um ATTOR N EY guaPatented Mar. 1l, 1930 PATENT OFFICE BRUCE E. ROSE, OF EXETER,CALIFORNIA SCRAPER Application fired February This invention relates toscrapers of the well known fresno type and particularly to the means forcont-rolling the movement of the bowl. Y

The present invention also relates particularly to the type of controlmeans shown in my (zo-pending application for patent, Serial No. 155,409filed December 17 th, 1926, and represents improvements thereover inproviding a simplified structure which accomplishes the same resultswith an efficiency equal to thatobtained with the previous device.

These objects I accomplish by means of such structure and relativearrangement of parts as will fully appear by a perusal of the followingspecification and claims.

1n the drawings similar characters of reference'indicate correspondingparts in the several views:

Fig. 1 is a. perspective view of the scraper in a transporting position.

Fig. 2 is a side elevation of the scraper in the same position.

Fig. 3 is a similar view showing the scraper in a loading position.

Fig. 4 is a fragmentary cross-section on the line 4 4l of Fig. 3. v

Referring now more particularly to the characters of reference on thedrawings, the numeral l denotes the scraper bowl of the usual fresnotype having a front cutting edge 2. The draft frame for the bowlincludes side beams 3 overlapping the sides of the bowl and extendingthence forwardly and in converging relation to each other, being adaptedat their forward; ends for connection to a tractor or other draft means.

ly from the sides ofthe bowl.

Longitudinally extending bars 6 are disposed between the draft beams andthe bowl,l

said bars at their rear ends being turnably fixed on the trunnions. Attheir forward ends, a sho-rtdistance ahead of the bowl, theV Thesebeamsy at their rear ends have longitudinal slots 4 in which trunnions 5are slidable, these trun-` nions being xed on andprojecting outward v 9,1929. serial No. '$38,809.

The upper arms of these bellcranks are provided with laterally anddiagonally extending sockets or pads 9 to receive the adjacent ends ofthearms l0, which converge thence to a junction with each other at thecenter of width of the scraper and are there secured to a forwardlyextending operating lever 11. These parts are so disposed that when thelower arms of the bellcranks are horizontally disposed or are inlongitudinal alinement with the beams 3, the bars 6 are similarlydisposed and the trunnions are then adjacent the rear ends of the slots4. Also the operating lever 11 is then substantially horizontallydisposed, as shown in Figs. 1 and 2.

The lever 11 is long enough tobe operated from the draft means and atits forward end has an upstanding handle portion 11a so that it can bemanipulated when the lever is in a horizontal and lowermost positionwithout the operator having to bend down excessively. Pivoted inconnection with the bars toward their forward ends are upstanding levers12 having on their lower endslat-erally and inwardly extending latchanges or lips 13 adapted to pass under and engage stop or catch pins 14projecting laterally from the bowl. The upper ends of these levers areconnected in common by a cross bail 15 to which a forwardly extendingpull rope 16 is atf tached, so that the lower ends of the levers may bepulled rearwardly to clear the pins. simultaneously and from the draftmeans to which the scraper is-attached. Springs 17 between the leversand bars 6 act to hold the vlatch flanges engaged with the pins andresist the pull on the rope.

The -latch flange and stop pins are so disposed relative to. the bars 6that when said bars are alined with the draft beams the cutting edge ofthe bowl is clear of the ground and the bowl rides only on its rear end,as shown in Fig. 2.

By reason of the above arrangementof parts it will be seen that the lineof draft is from the front end of the beams 3 along said beams to thebellcrank pivots 8, then through the lower arms of the bellcranks andalong the bars 6 to the bowl trunnions. Since the natural tendency forsaid line of draft is to extend in a straight line if possible the bars6 and the adjacent bellcrank arms will naturally tend to assume andremain horizontal or in longitudinal alinement with the draft beams.

The normal position of the bowl therefore is with its cutting edgetipped up or clear of the ground, since the latch levers are nori mallyengaged with the stop pins,- and since the levers are mounted on themovable bars the adjacent portion of the bowl must move up and down withthe saine. When` the lever 11 is thrown up and back the lower arms ofthe bellcranks are moved down and forwardly, similarly moving the barsand drawing the trunnions forward in the slots. The forward ends of thebars moving down, the latch' levers move down also and of course thepins 14 'follow 'up such I movement of the latches, since the tendencyof the bowl is to always rotate downwardlywith-the forward movement ofthe scraper.- The forward end of 'the-bov'vl and the cutting blade willtherevfore be lowered while the back end or from the trunnionsrearwardly will remain fat approximately the same level as'before,'since it is kept from any appreciable change of level by theslots 4 in which the trunnions ride. In fact the slots 4 may have aslight upward stroke from back to front as shown so that the trunnionswould be raised somewhat-'from their original positions, increasing thedownward and forward slant of the bowl obtained by reason of the abovedescribed movements.

The blade is now contacting with the ground asshown in Fig. 3 andthe'bowl is in position'to'load. With the forward movement of thescraper two opposing forces are at work. The frictional-engagement ofthe blade with the ground tends to maintain the bowl tilted forwardly,while theresistance of the bowl as a whole tends to cause the line of.

draftto straighten out, wl'ii'ch would reverse the tilt of the bowl 'aspreviously explained.

Atirst the frictional engagement of the blade with the groundex'ertsagreater force than the resistance of the bowl and `it remains rin suchforwardly tiltedposition. yAs the dirt enters the bowl and 4moves towardthe backV of the same, the weight of the bowl and its contents and theresistance thereof gradually increases. Also the dirt has a tendency tolower the back of the bowl and roel; the sainev on its trunni'ons toraise the front end. Finallythe resistance of the bowl, aided by the inlu trunnions, longitudinally extending draft beams having longitudinalslot-s through completely, lowering the lever l1 to a hori`zon" talposition and causing the bars 6Y to lie horizontally and the bowl to bemoved so that it has a'rearward tilt, as previously described.

lThe loaded bowl is therefore 4in a transporting position without anywork on the part ofthe operator being necessary, though if at any timeshould he desire to 'cease loading operations before the bowlautomatically tilts, he may easily do it by pulling down on the lever1l. This operation does not require much physical effort, since, asexplained, the bowl is itself tending to move to this desired position.

When it is intended to dump the load it is only necessary to pull therope 16 which allows the bowl to rotate forwardly regardless of theposition of the bars 6, the same as described in the previousapplication.

F rom the foregoing description it will be readily seen that I have'produced such a device as substantially lfulfills the objects of theinvention as set forth herein.

While this specification sets forth in detail the present and preferredconstruction of the device, still in practicesuch deviations from suchdetail may be resorted to as do not form a departure from the spirit ofthe invention, as defined by the appended claims.

Having thus described my invention what l claim as new and useful anddesire to secure by Letters Patent is Y i l.v A scraper comprising abowl having side trunnions, longitudinally extending draft beams havinglongitudinal slots through which the trunnions slidably project, armspivoted at their forward ends onto the beams j posed toward the rearends ofthe slots, means maintaining lthe bowl normally Vrigid with thebars and in such relation thereto that the bowl has an upward bottomslope from back to front when the bars are disposed in said straightValinement with the arms, and means for turning said arms downwardlyabout the pivots to 'cause the bars to be lowered at their forward endsand the bowl to be likewise lowered 'at its forward end sor-that thebottom slope of the bowl is reversed.

2. A structure as in claim l, in whichthe draft-beam slots have anupward slope toward their upper ends whereby when the forward ends vofthe bars are lowered 'and moved forward and the trunnions are movedforward? along the slots, the bottom of the bowl in thelongitudinalplane of the trunnions will be raised relative to the beams.

3. A scraper comprising a-bowl having side which the trunnion'svslidably project, arms pivoted at their forward ends onto the beamsahead of thetrunnions, bars pivoted at 'their` forward. ends on the rearends of' the 'arms and vat their 'rear ends on the trunnions; saidtrunnions, when the arms and bars 4are in straight'alinement with eachother, being disposed toward the rear ends of the slots, re-

leasable means between the bowl and bars' toward the forward ends of thelatter to normally hold the bowl against forward rotation about itstrunnions, said means being arranged to position the bowl so that thebottom thereof has an upward slant from back to front when said arms andbars are thus alined, and an operating lever connected to the arms toturn the latter downwardly and forwardly about their pivotal connectionswith the beams.

4. A scraper comprising a bowl having side trunnions, longitudinallyextending draft beams having longitudinal slots through which thetrunnions slidably project, arms pivoted at their forward ends onto thebeams ahead of the trunnions, bars pivoted at their forward ends on therear ends of the arms and at their rear ends on the trunnions; saidtrunnions, when the arms and bars are in straight alinement with eachother, being disposed toward the rear ends of the slots, meansmaintaining the bowl normally rigid with the bars and in such relationthereto that the bowl has an upward bottom slope from back to front whenthe bars are disposed in said straight alinement withthe arms, and meansfor breaking such straight alinement downwardly between the pivotalconnections of the arms with the beams and the trunnions.

5. A scraper comprising a bowl having side trunnions, longitudinallyextending draft beams having longitudinal slots through which thetrunnions slidably project, arms pivoted at their forward ends onto thebeams ahead of the trunnions, bars pivoted at their forward ends on therear ends of the arms and at their rear ends on the trunnions; saidtrunnions, when the arms and bars are in straight alinement with eachother, being disposed toward the rear ends of the slots, meansmaintaining the bowl normally rigid with the bars and in such relationthereto that the bowl has an upward bottom slope from back to front whenthe bars are disposed in said straight alinement with the arms, and anoperating lever connected to the arms to turn the latter downwardly andforwardly about their pivotal connections with the beams; said leverbeing arranged to extend forwardly and horizontally from said arms whenthe latter are longitudinally alined with the bars and to be swungupwardly and rearwardly from such position to lower the arms.

In testimony whereof I aiiix my signature.

BRUCE E. ROSE.

